package cn.edu.ctbu.dp001.api;

import cn.edu.ctbu.dp001.constant.REnum;
import cn.edu.ctbu.dp001.entity.Student;
import cn.edu.ctbu.dp001.exception.RException;
import cn.edu.ctbu.dp001.service.StudentService;
import cn.edu.ctbu.dp001.util.RUtil;
import cn.edu.ctbu.dp001.vo.QueryObj;
import cn.edu.ctbu.dp001.vo.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.*;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/api/student")
public class StudentApiController {
    @Autowired
    private StudentService studentService;

    @GetMapping("/list/all")
    public R<List<Student>> findAll(){
        List<Student> students = studentService.getAll();
        return RUtil.success(students);
    }

    @GetMapping("/{id}")
    public R<List<Student>> findById(@PathVariable int id){
        Student student = studentService.findById(id);
        return RUtil.success(student);
    }

    @PostMapping("/add")
    public R<Student> add(Student student){
        return RUtil.success(studentService.add(student));
    }

    @PutMapping("/update")
    public R<Student> update(Student student){
        return RUtil.success(studentService.update(student));
    }

    @DeleteMapping("/delete/{id}")
    public R delete(@PathVariable Integer id){
        studentService.delete(id);
        return RUtil.success();
    }

    @DeleteMapping("/deleteMultiple")
    public R deleteMultiple(@RequestBody List<Integer> ids){
        studentService.deleteMultiple(ids);
        return RUtil.success();
    }

    @GetMapping("/list")
    public R<List<Student>> getStudentsByName(@RequestParam String name) {
        List<Student> student= studentService.findByName(name);
        return RUtil.success(student);
    }

    @GetMapping("/validateUser")
    public R validateSnoAndPassword(String sno,String password)throws Exception{
        return RUtil.success(studentService.validateUsernameAndPassword(sno,password));
    }

    @PostMapping("/getbypage")
    public R<Page<Student>> getByPage(@RequestBody QueryObj<Student> qObj){
        //按id排倒序
        Sort sort=Sort.by(Sort.Direction.DESC,"id");
        Integer pageIndex=0;
        Integer pageSize=10;
        if(qObj==null){
            //student名字为空就直接调用分页
            Pageable pageable= PageRequest.of(pageIndex,pageSize,sort);
            Page<Student> students=studentService.getAll(pageable);
            return RUtil.success(students.getContent(),students.getTotalElements());
        }else{
            pageIndex=qObj.getPage()-1;
            pageSize=qObj.getLimit();
            if(qObj.getData() instanceof Student){
                Student student=(Student)qObj.getData();
                Pageable pageable= PageRequest.of(pageIndex,pageSize,sort);


                ExampleMatcher matcher=ExampleMatcher.matching()
                        .withMatcher("name",ExampleMatcher.GenericPropertyMatchers.contains())
                        .withIgnoreNullValues();

                Example<Student> example=Example.of(student,matcher);
                Page<Student> studentPage=studentService.getAll(example,pageable);
                return RUtil.success(studentPage.getContent(),studentPage.getTotalElements());
            }else{
                throw new RException(REnum.QUERY_ERR);
            }
        }
    }
}